Hello,I use a NAS Iomega StorcenterPro 150d (S/N KGAJ110026) which indicates in Event logs that a volume has failed, but I don't know which one, I have four disks. All LED are blue, and NAS is trying to repair something, event logs are doing a loop with following messages: "A volume has failed", "RAID rebuild in progress; please do not shut down" (two times). Disk management shows following configuration: capacity 2134 GB, space available 2134 GB, status Offline or Online (Rebuilding), type striping with parity (RAID 5).Can you explain me how to detect which volume has failed, how to restore it, and if data can be found somewhere (because RAID 5 should be redundancy configuration)?Thank you.Best regards,MAP

This sounds bad. When it's rebuilding it means all disks are working, else the array would simply be degraded. I can't think of a scenario which can lead to this state, and so I don't know what to recommend.

Somehow the files on the filesystem got lost. There can be a lot of causes for that, including a user fault. As actually wiping that information would take hours, normally it's still there, and theoretically it can be recovered using low-level tools like PhotoRec.You have a raid5 array, which means the filesystem is distributed over 4 disks. That complicates the matter, as it's necessary to assemble the array before any low-level recovery can be applied.And it's rebuilding, because of an unknown scenario. If it's actually only rebuilding the old array, it doesn't matter (much). But if it for some reason is building another array with different settings, it's virtually impossible to assemble the original array, which makes it equally virtual impossible to do low level recovery.

You can have a look if assembling the array and running PhotoRec will recover your data. Unless we can find a reason for what happened it's impossible to revert it.

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